ASSEMBLY STEP 4
Install the Belt and Set the Tension
INSTALLING THE BELT
1.Drop the notched side of the trolley clip into the retaining slot on top of the trolley (Figure 1).
2.Grasp the clip connector at the end of the belt and slip it through the belt pulley bracket from behind, around
the pulley and toward the trolley.
WARNING
To avoid possible SERIOUS INJURY to fingers from moving garage door opener:
•ALWAYS keep hand clear of sprocket while operating opener.
•Securely attach sprocket cover BEFORE operating.
3. Fasten the belt clip connector to the |
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Belt Clip |
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trolley clip with a master link: |
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Connector | Master Link | Master |
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•Push pins of master link bar |
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| Link Cap |
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through holes in trolley clip and belt |
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| Trolley |
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clip connector. | Slip Belt Clip |
| Clip | Pin Notch |
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•Push master link cap over pins and |
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Connector around |
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| Trolley | ||
past pin notches. | Pulley Bracket |
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| Threaded Shaft | Link Bar |
from this direction |
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•Slide | and attach to trolley clip |
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pin notches until both pins are securely |
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locked in place. |
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| Master |
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| Link Bar |
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4. With the trolley against the screwdriver, dispense the belt along the rail and around the motor unit sprocket. The sprocket teeth must engage the belt (Figure 2).
5.Use the second master link to connect the belt to the flat end of the trolley threaded shaft (Figure 1). Check to make sure the belt is not twisted.
Belt Pulley
Belt
Clip Connector
Motor unit
Sprocket
Figure 2
6. Remove the screwdriver.
SETTING THE TENSION
1.Insert the trolley threaded shaft through the hole in the trolley.
2.Hold the belt at the trolley shaft to avoid twisting as you thread the spring/trolley nut by hand on the
shaft until finger tight against the trolley (Figure 3). | Figure 3 |
Do not use any tools. |
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3. Insert a screwdriver tip into one of the nut ring |
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slots and brace it firmly against the trolley. |
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(Figure 4). |
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4. Place a 7/16" open end wrench on the square end. |
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Rotate about 1/4 turn until the spring releases and |
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snaps the nut ring against the trolley (Figure 5). |
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This extends the spring for optimum belt tension. |
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Figure 5
Trolley |
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| Trolley |
| Nut Ring |
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BEFORE |
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Trolley
Threaded
Shaft
Spring/Trolley Nut
Figure 4 | Trolley |
Threaded | |
| Shaft |
Nut
Ring
Square
End
Nut Ring
Slots
10